#12 multiple user support for pooler

[Michael Paquier]

This patch lights up postgresql.conf by deleting data_node_users, data_node_passwd, coord_user and coord_passwd.
Patch is attached.

It may need some extensions to support secured connections and password support.

[Michael Paquier]

[Michael Paquier]

Password support is not necessary.
As long as access to tables is granted through the cluster, a user can access to Data on Datanodes.
Remote Coordinator is here to play the blocking role if necessary.

[Michael Paquier]

[Michael Paquier]

Addition of an updated patch. Password is not necessary.

[Michael Paquier]

This has been committed.